[net-next-2.6.git] / include / net / scm.h

#ifndef __LINUX_NET_SCM_H
#define __LINUX_NET_SCM_H

#include <linux/limits.h>
#include <linux/net.h>

/* Well, we should have at least one descriptor open
 * to accept passed FDs 8)
 */
#define SCM_MAX_FD	(OPEN_MAX-1)

struct scm_fp_list
{
	int		count;
	struct file	*fp[SCM_MAX_FD];
};

struct scm_cookie
{
	struct ucred		creds;		/* Skb credentials	*/
	struct scm_fp_list	*fp;		/* Passed files		*/
	unsigned long		seq;		/* Connection seqno	*/
};

extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
extern void __scm_destroy(struct scm_cookie *scm);
extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);

static __inline__ void scm_destroy(struct scm_cookie *scm)
{
	if (scm && scm->fp)
		__scm_destroy(scm);
}

static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
			       struct scm_cookie *scm)
{
	struct task_struct *p = current;
	scm->creds.uid = p->uid;
	scm->creds.gid = p->gid;
	scm->creds.pid = p->tgid;
	scm->fp = NULL;
	scm->seq = 0;
	if (msg->msg_controllen <= 0)
		return 0;
	return __scm_send(sock, msg, scm);
}

static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
				struct scm_cookie *scm, int flags)
{
	if (!msg->msg_control)
	{
		if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
			msg->msg_flags |= MSG_CTRUNC;
		scm_destroy(scm);
		return;
	}

	if (test_bit(SOCK_PASSCRED, &sock->flags))
		put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);

	if (!scm->fp)
		return;
	
	scm_detach_fds(msg, scm);
}


#endif /* __LINUX_NET_SCM_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __LINUX_NET_SCM_H
	2	#define __LINUX_NET_SCM_H
	3
	4	#include <linux/limits.h>
	5	#include <linux/net.h>
	6
	7	/* Well, we should have at least one descriptor open
	8	* to accept passed FDs 8)
	9	*/
	10	#define SCM_MAX_FD (OPEN_MAX-1)
	11
	12	struct scm_fp_list
	13	{
	14	int count;
	15	struct file *fp[SCM_MAX_FD];
	16	};
	17
	18	struct scm_cookie
	19	{
	20	struct ucred creds; /* Skb credentials */
	21	struct scm_fp_list fp; / Passed files */
	22	unsigned long seq; /* Connection seqno */
	23	};
	24
	25	extern void scm_detach_fds(struct msghdr msg, struct scm_cookie scm);
	26	extern void scm_detach_fds_compat(struct msghdr msg, struct scm_cookie scm);
	27	extern int __scm_send(struct socket sock, struct msghdr msg, struct scm_cookie *scm);
	28	extern void __scm_destroy(struct scm_cookie *scm);
	29	extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
	30
	31	static __inline__ void scm_destroy(struct scm_cookie *scm)
	32	{
	33	if (scm && scm->fp)
	34	__scm_destroy(scm);
	35	}
	36
	37	static __inline__ int scm_send(struct socket sock, struct msghdr msg,
	38	struct scm_cookie *scm)
	39	{
1d541ddd BL	40	struct task_struct *p = current;
	41	scm->creds.uid = p->uid;
	42	scm->creds.gid = p->gid;
	43	scm->creds.pid = p->tgid;
	44	scm->fp = NULL;
	45	scm->seq = 0;
1da177e4 LT	46	if (msg->msg_controllen <= 0)
	47	return 0;
	48	return __scm_send(sock, msg, scm);
	49	}
	50
	51	static __inline__ void scm_recv(struct socket sock, struct msghdr msg,
	52	struct scm_cookie *scm, int flags)
	53	{
	54	if (!msg->msg_control)
	55	{
	56	if (test_bit(SOCK_PASSCRED, &sock->flags) \|\| scm->fp)
	57	msg->msg_flags \|= MSG_CTRUNC;
	58	scm_destroy(scm);
	59	return;
	60	}
	61
	62	if (test_bit(SOCK_PASSCRED, &sock->flags))
	63	put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
	64
	65	if (!scm->fp)
	66	return;
	67
	68	scm_detach_fds(msg, scm);
	69	}
	70
	71
	72	#endif /* __LINUX_NET_SCM_H */
	73